It took me a little over 20K hands at NL100 to get back to NL200, the level I started this month at. The reason for this taking so long is a 13-buyin downswing I experienced in the first 9k hands. The graph shows this in more detail.
I have also played some hands on Prima network in the meantime, making 7 buyins at NL100 along the way.
So I am back at NL200 following the aggressive BR strategy on both sites, although I spend less time playing on Prima.
I can only do my best and hope to reach NL400 without having to step back again at NL100.